Box for forming molds



E. FRIES.

BOX FOR FORMING MOLDS.

APPLICATION FILED OCT. 11,1919.

1,845, 1 60. Patented June 29, 1 920.

3 SHEETS-SHEET I.

E. FRIES.

BOX FOR FORMING MOLDS- APPLICATION FILED OCT. 11. 1919.

Patented June 29, 1920.

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BOX FOR FORMING MOLDS- v APPLICATION FILED OCT. 11, 1919 v 1,345,160, Patentedlune 29, 1920.

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= BOX FOR roRMINGMo ns.

' Specification of Letters Patent. Patented June 29, 1920,

A plication filed October 11, '1919. Serial No. 330,075.

To all whom it mag concern:

Be it known that I, EDWARD FRIES, a citizen of the United States, and a resident of Moores, county of Delaware, State of Pennsylvania, have invented certain Improvements in Boxes for Forming lVIolds, of which the following is aspecification.

My invention relates to certain improvements in flasks, or .boxes,- in which'a sand mold is made. e 1 q The invention is especially adapted for use in making intricate molds, such as locomotive cylinder castings. y

One object of the invention is to m ake a flask, or box, in which the mold is i'ormed, the box being removed from the formed mold. V V i A further objectof the invention is to make the box adjustable so as to allow for the ready removalof the box from themold.

These objects l attain inthe following manner, reference beinghad to the. accompanying drawings, in which Figure l is a perspective view of my im proved box, in wlnchthe mold is formed;

F ig.'2 is a. sectlonal vlew through the box,

showingthe pattern in position and the mold rammed around the pattern;

Fig. 3 is a view', similar to F ig. 2, showing the box. inverted; 7 H f I Fig. 4 is a perspective view showing the mold on the bottom plate ready to be transferred to the baking oven; i

Fig. 5 is a plan view illustrating a modification of the invention;

Fig. 6 is a side view of the box shown in Fig. 5;

Figs. 7 and 8 are side views of the two 7 plates of the box; and

Fig. 9 is a perspective view of one of the wedges. v

The box, in the present instance, is rectangular in shape, and consists of two end plates l1, flanged as shown and suitably braced by ribs and side plates 22, each having bracing ribs. Each side plate has a projecting trunnion 3. These trunnions are engaged by the hooks of a crane so that the flask can be readily handled and inverted. Bolts 4 secure the end plates to the side plates. Each end plate projects into. the flask forming shoulders 5 at each side and located in the flask at each side are plates 6 pivoted to the end plates at 7, as clearly shown in the drawings. Wedges 8 are attached to the bottom plate.

driven between the side plates 6 and the sides of the box so as to force the plates firmly against the shoulders 5 of the end plates. This makes a rigid construction in which the mold can be formed. 9 is a plate on. which the pattern at is mounted, as shown in Fig. 2, and the sand 3 forming the mold is .rammedin the box around the patternm.

A plate 10 is located on the mold within the box. Then the box is inverted, as illustrated in Fig. 3, the plate 10 becoming the j bottom plate of the mold; hen in this position, the wedges 8 are driven out so as to loosen the plates 6, which then swing loosely on their pivots and the box can be bodily removed from the mold, after 'which the pattern a is. withdrawn,- leaving the mold y on the bottom plate 10, as illustrated in Fig. 4L The slings 11 are then These slings may be madeof rods, asillustrated in Fig. 4, or they may be wire cables, depending considerably upon the size of the mold. The slings are then engaged by the cross bar 12 of a crane, as shown in Fig. 4;, and the bottom plate, with the mold, is carried to the baking oven when a baked mold is desired,

or it may be assembled for castingwithout bakin I 7 i In igs. 5 .to 9, inclusive, I have shown a modification of the invention in which 1 are the ends of the box and 2 are the sides. 6* are; the plates located within the box.

full depth of the box and retain the plates in the fixed position againstthe pressure of the sand rammed around the pattern. After the sand is rammed and the bottom plate placed'in position the box is inverted and the wedges driven out so as to loosen the plates 6 and allow for the ready withdrawal of thebox from the mold.

The operation is as follows: A box of a proper size is selected for a given casting ders 5 of the box, making a rigid support for the center of the mold, which is then rammed around the pattern. The plate 10 'Between'projections 13 .onthe back of the f plates and the sides 2 are wedges 14. These wvedges extend, in the present instance, the

. is then placed in position onthe mold and the plate 10 becomes the bottom plate.

clamped to the box.

The hooks of a crane then engage the trunnions 3 and the box,

with the pattern, mold and plate, is, lifted,

leaving the plate 9 on the molding floor. Then the box is turned on the trunnions %I1l1d e wedges and clamps are removed, leaving the plates 6 to swing on their pivots so that when the box is raised it will be withdrawn from the mold, which rests on the bottom plate 10, after which the pattern is with{ drawn.

plate and the cross bar of a crane is hooked onto the slings and the plate, with the mold thereon, is conveyed to the baking oven. .After the mold has been baked a sufficient length of time any'cores that are to be assembled on the mold are placed inposition, the mold not being inclosed by a flask but open so that the cores can be properly located. Then the mold is placed in a suitable flask and a casting is made.

It will be seen by the above construction that a single box can be used for any number of molds, as the box is only used to form the mold. This box is removed from the mold when formed, therefore, fewer flasks are required, with the result'that the moldin floor is not overcrowded with flasks.

Furt iermore, the boxes are not subjected to heat and, consequently, are not destroyed,

as is the'case where flasks are used in which the mold is made and which inclose the mold during the baking and casting operation.

In some instances, the plate 10 may extend into the box so as to insure a neat fit between the box and the plate. WVhile I have shown two pivoted side plates, a box 7 may be provided with one fixed side plate and one movable side plate to allow the box to be withdrawn from the mold.

g The slings 11 are then attached tothe bottom 7 side plates and 'ed within the box; and means 'for holding the said pivoted side plates rigid while the mold is being formed.

The. combination of a box having rigid end walls; pivoted side plates located within the box, the pivots being at one end; shoulders on the end walls against which the pivoted plates rest; and means for holding the side plates against the shoulders while the mold is being formed.

t. The combination of a box having side plate within the box; and wedges located between the said movable side plate 7 and one of the permanent sides of the mold.

'permanent side and end walls, a movable each end wall having shoulders at mounted at one end to the end wallsso as v to swing freely Within the box; wedges engaging the'opposite end or the plates for retaining the saidplates rigidly against the shoulders ofthe end walls; a pattern plate recessed to receive the pivot portions of the side plates and having a surface to receive the pattern; andia' bottom plateclamped to the other end of the box on top of the mold when formed, said plate forming a supporting bottom plate for the [hold when inverted.

EDWARD FRIES. 

